it has traces of xhem cal compounds. once detected it alerts screeners by taking a closer look. the makers say their product is more traditional methods. >> the steel shank in the shoe will be metal did ybut it doesn necessarily tell you it's an explosive. the advantage to explosive traces we are telling you exactly what it is that you have detected. >> it has been used in pirates across the country. it can also detect illegal drugs. >> i understand cargo ships on planes does not necessarily go through the same kind of screening process as people in their bags do. the they could be sitting in cargo that is not screened by explosive devices. they want all packages to be screened but the frait industry had trouble with complying with the mandates. it works faster than most experts still have concerns over the ability to detect explosive devices. >> it's a piece of mobile equipment, desk top equipment that apparently pack ab age at a time. there are thousands and thousands upon packages that come into the airport every day. just can't do it rapidly enough. >> the device is already